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How actors are stored in Engine?

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HI Guys, I was wondering how are Objects (Actors, UObjects) stored in the Engine. I think that there should be some massive TArray or Set which is iterated every frame to call Update and Render function on every object.

So you are creating your own engine for your game and want to see what ue 4 does as a reference? The engine is a bit more complex to just have a simple Update or Render functions for them. For the Update you have to look at the code and see what PrimaryTickActor does, because afaik that is what calls the tick function. Can't help you with the Render function, not familiar with the engine code on that part.